Casper Weather Forecast

    • 49
    • 81

    Increasing Clouds

    • 50
    • 79

    Mostly Cloudy

    • 44
    • 73

    Chance Rain Showers

    • 44
    • 69

    Partly Sunny

    • 44
    • 73

    Mostly Sunny

    • 44
    • 72

    Mostly Sunny

Today 26 Sep Natrona County Lower Elevations

Sunny, breezy with Highs in the upper 70s. North Winds 10 to 15 Mph, becoming southwest 15 to 20 Mph with Gusts up to 30 Mph in the afternoon.

Tonight 26 Sep Natrona County Lower Elevations

Partly cloudy. Lows around 50. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph, becoming northwest after midnight.

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Casper Temperature Statistics

September Temperature

Casper, Natrona County International Airport (8.1 miles)

  • Lowest 9 September, 2026

    36.6 °F

  • Average September

    64.7 °F

  • Highest 5 September, 2026

    91.7 °F

Climate (2021–2026)

Casper, Natrona County International Airport (8.1 miles)

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  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    47.7 °F

  • Average High 2021–2026

    61.6 °F
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